JP2005019778A - Wire bonding method - Google Patents
Wire bonding method Download PDFInfo
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- JP2005019778A JP2005019778A JP2003183917A JP2003183917A JP2005019778A JP 2005019778 A JP2005019778 A JP 2005019778A JP 2003183917 A JP2003183917 A JP 2003183917A JP 2003183917 A JP2003183917 A JP 2003183917A JP 2005019778 A JP2005019778 A JP 2005019778A
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Abstract
Description
【0001】
【発明の属する技術分野】
本発明は、第1ボンド点と第2ボンド点間をワイヤで接続するワイヤボンディング方法に係り、特に低ワイヤループ形成方法に関する。
【0002】
【従来の技術】
第1ボンド点と第2ボンド点間を接続したワイヤに垂れが生じると、ワイヤがダイに接触して電気的なショートが生じる。これを防止するため、従来は、第1ボンド点にボールを圧着して圧着ボールを形成した後、圧着ボール上に上方に伸びたネック高さ部を形成し、ネック高さ部の上端に屈折部(癖)を形成している(例えば特許文献1参照。)。
【0003】
【特許文献1】
特開平10−189641号公報
【0004】
【発明が解決しようとする課題】
従来技術の方法は、圧着ボール上にネック高さ部を形成するので、必然的に高いワイヤループとなる。近年、半導体装置は小型化及び薄型化の傾向にあるが、従来技術の方法では、この要望を十分に満足させることができなかった。
【0005】
本発明の課題は、圧着ボール直上のワイヤに強い屈折部を形成することができ、低ワイヤループ化が図れるワイヤボンディング方法を提供することにある。
【0006】
【課題を解決するための手段】
上記課題を解決するための本発明の請求項1は、第1ボンド点と第2ボンド点との間をワイヤで接続するワイヤボンディング方法において、第1ボンド点にワイヤの先端に形成されたボールを圧着して圧着ボールを形成する工程と、次に圧着ボール上にワイヤを押圧して圧着ワイヤを形成する工程と、その後キャピラリを上昇させてワイヤを繰り出し、キャピラリを第2ボンド点の方向に移動させてワイヤを第2ボンド点に接続する工程とを行うことを特徴とする。
【0007】
上記課題を解決するための本発明の請求項2は、第1ボンド点と第2ボンド点との間をワイヤで接続するワイヤボンディング方法において、第1ボンド点にワイヤの先端に形成されたボールを圧着して圧着ボールを形成する工程と、次に圧着ボール上にワイヤを押圧して圧着ワイヤを形成する工程と、その後キャピラリを上昇させ、続いてキャピラリを第2ボンド点と反対方向に移動させるリバース動作を少なくとも1回行う工程と、その後キャピラリを上昇させてワイヤを繰り出し、キャピラリを第2ボンド点の方向に移動させてワイヤを第2ボンド点に接続する工程とを行うことを特徴とする。
【0008】
上記課題を解決するための本発明の請求項3は、上記請求項1又は2において、前記圧着ワイヤを形成する工程は、圧着ボールを形成した後にキャピラリを上昇させ、続いて第2ボンド点と反対方向に移動させてリバース動作を行う工程と、次にキャピラリを僅かに下降させる工程と、続いてキャピラリを上昇させ、その後キャピラリを第2ボンド点の方向に該第2ボンド点と反対側のキャピラリの下面が前記圧着ボールの上方に位置するように移動させる工程と、次にキャピラリを下降させてワイヤを圧着ボール上に押圧する工程よりなることを特徴とする。
【0009】
上記課題を解決するための本発明の請求項4は、上記請求項1又は2において、前記圧着ワイヤを形成する工程は、圧着ボールを形成した後にキャピラリを上昇させ、その後キャピラリを第2ボンド点の方向に該第2ボンド点と反対側のキャピラリの下面が前記圧着ボールの上方に位置するように移動させる工程と、次にキャピラリを下降させてワイヤを圧着ボール上に押圧する工程よりなることを特徴とする。
【0010】
【発明の実施の形態】
本発明のワイヤボンディング方法の第1の実施の形態を図1及び図2により説明する。図2(b)に示すように、セラミック基板やプリント基板等の基板又はリードフレーム等よりなる回路基板1上には、電極パッド2が形成されたダイ3がマウントされている。電極パッド2の第1ボンド点Aと回路基板1の配線又はリード等の第2ボンド点B間はワイヤ4により電気的に接続される。
【0011】
まず、図1(a)に示すように、ワイヤ4をクランプするクランパ(図示せず)は開状態で、キャピラリ5が下降して第1ボンド点Aにワイヤ4の先端に形成されたボールをボンディングして圧着ボール11を形成した後、キャピラリ5はC点まで少し上昇してワイヤ4を繰り出す。次に図1(b)に示すように、キャピラリ5を第2ボンド点B(図2(b)参照)と反対方向のD点まで水平移動させる第1のリバース動作を行う。続いて図1(c)に示すように、キャピラリ5をE点まで僅かに下降させる。この図1(a)から(c)の工程により、圧着ボール11から僅かに上方のワイヤ4の部分に腰の強い屈折部21が付けられる。
【0012】
次に図1(d)に示すように、キャピラリ5をF点まで上昇させる。続いて図1(e)に示すように、キャピラリ5を第2ボンド点Bの方向に、該第2ボンド点Bと反対側のキャピラリ5の下面5aが圧着ボール11の上方に位置するようにG点まで水平移動させる。次に図1(f)に示すように、キャピラリ5をH点まで下降させてワイヤ4を折り曲げて圧着ボール11上に重ね合わせて押圧する。これにより、圧着ボール11上に圧着ワイヤ12が形成される。この図1(e)及び(f)に示す工程により、圧着ワイヤ12の端部には強い屈折部22が形成される。
【0013】
次に図1(g)に示すように、キャピラリ5は第1ボンド点Aと第2ボンド点Bに接続するワイヤ長だけI点まで上昇してワイヤ4を繰り出す。その後は従来と同じ動作を行う。即ち、図2(a)に示すように、キャピラリ5は円弧運動又は円弧運動後に下降して第2ボンド点Bに位置し、第2ボンド点Bにワイヤ4をボンディングする。次に図示しないクランパ及びキャピラリ5が共に上昇し、この上昇途中でクランパが閉じ、図2(b)に示すように、ワイヤ4は第2ボンド点Bの根元より切断される。これにより、第1ボンド点Aと第2ボンド点B間にワイヤ4が電気的に接続される。
【0014】
前記したように、図1(b)のリバース動作の後に図1(c)のようにキャピラリ5を下降させるので、圧着ボール11から僅かに上方のワイヤ4部分に強い屈折部21が形成される。また図1(f)の工程により圧着ボール11上にワイヤ4を押圧して圧着ワイヤ12を形成するので、圧着ワイヤ12の端部に強い屈折部22が形成される。このように、強い屈折部21、22が形成されることにより、第1ボンド点Aと第2ボンド点B間に接続したワイヤ4には弛みが生じない。また圧着ボール11上にはワイヤ4のネック高さ部が存在しないので、極めて低いワイヤループが形成される。
【0015】
本発明のワイヤボンディング方法の第2の実施の形態を図3により説明する。なお、図1及び図2と同じ又は相当部材若しくは相当部分には同一符号を付し、その詳細な説明は省略する。本実施の形態は、図3(e)に示すように、ワイヤ4の途中に屈折部23を形成したものである。
【0016】
まず、図1(a)乃至(f)の工程により圧着ボール11上に圧着ワイヤ12を形成する。次に図3(a)に示すように、キャピラリ5は図3(e)の水平部分31の長さだけJ点まで上昇する。続いて図3(b)に示すように、第2ボンド点Bと反対方向にK点まで円弧運動して下降する第2のリバース動作を行う。これにより、ワイヤ4は傾斜状態となり屈折部23が形成される。次に図3(c)に示すように、キャピラリ5は図3(e)の傾斜部32の長さだけL点まで上昇する。その後は図2(a)(b)と同じ動作を行い、図3(d)(e)に示すように、ワイヤ4を第2ボンド点Bにボンディングする。
【0017】
本実施の形態は、前記実施の形態の効果の他に次のような効果が得られる。ワイヤループの途中に屈折部23を形成するので、圧着ワイヤ12と屈折部23間はほぼ水平部分31となる。この水平部分31の存在により、例えばダイ3が2点鎖線で示すように伸びており、第1ボンド点Aとダイ3の端部との距離が長くてもダイ3との接触が防止でき、又は第1ボンド点Aと第2ボンド点Bの距離が長い場合にもワイヤループの垂れ下がりが小さくて効果的である。
【0018】
本発明のワイヤボンディング方法の第3の実施の形態を図4により説明する。まず、図4(a)に示すように、ワイヤ4をクランプするクランパ(図示せず)は開状態で、キャピラリ5が下降して第1ボンド点Aにワイヤ4の先端に形成されたボールをボンディングして圧着ボール11を形成した後、キャピラリ5はC点まで上昇してワイヤ4を繰り出す。この工程は、図1(a)の工程と同じである。
【0019】
次に図4(b)に示すように、キャピラリ5を第2ボンド点Bの方向に、該第2ボンド点Bと反対側のキャピラリ5の下面5aが圧着ボール11の上方に位置するようにM点まで水平移動させる。次に図4(c)に示すように、キャピラリ5をN点まで下降させてワイヤ4を圧着ボール11上に重ね合わせて押圧する。これにより、圧着ボール11上に圧着ワイヤ13が形成される。この図4(b)及び(c)に示す工程により、圧着ワイヤ13の端部には強い屈折部24が形成される。
【0020】
次に図4(d)に示すように、キャピラリ5は第1ボンド点Aと第2ボンド点Bに接続するワイヤ長だけO点まで上昇してワイヤ4を繰り出す。その後は従来と同じ動作を行う。即ち、図4(e)に示すように、キャピラリ5は円弧運動又は円弧運動後に下降して第2ボンド点Bに位置し、第2ボンド点Bにワイヤ4をボンディングする。次に図示しないクランパ及びキャピラリ5が共に上昇し、この上昇途中でクランパが閉じ、図4(f)に示すように、ワイヤ4は第2ボンド点Bの根元より切断される。これにより、第1ボンド点Aと第2ボンド点B間にワイヤ4が電気的に接続される。この図4(d)から図4(f)までの工程は、図1(g)、図2(a)(b)の工程と同じである。
【0021】
前記したように、図4(c)の工程により圧着ボール11上にワイヤ4を押圧して圧着ワイヤ13を形成するので、圧着ワイヤ13の端部に強い屈折部24が形成される。このように、強い屈折部24が形成されることにより、第1ボンド点Aと第2ボンド点B間に接続したワイヤ4には弛みが生じない。また圧着ボール11上にはワイヤ4のネック高さ部が存在しないので、極めて低いワイヤループが形成される。
【0022】
本発明のワイヤボンディング方法の第4の実施の形態を図5により説明する。本実施の形態は、図3に示す第2の実施の形態を図4に示す実施の形態に適用したものである。即ち、図4(a)乃至(c)の工程により圧着ボール11上に圧着ワイヤ13を形成した後、図5(a)乃至(e)の工程、即ち、図3(a)乃至(e)の工程を行ったものであるので、その詳細な説明は省略する。従って、本実施の形態においても第2の実施の形態と同様の効果が得られる。
【0023】
なお、図3の第2の実施の形態及び図5の第4の実施の形態においては、屈折部22と第2ボンド点B間のワイヤ4部分に1個の屈折部23を形成したが、2個以上のリバース動作を行って2個以上の屈折部を形成してもよい。
【0024】
【発明の効果】
本発明は、第1ボンド点にワイヤの先端に形成されたボールを圧着して圧着ボールを形成する工程と、次に圧着ボール上にワイヤを押圧して圧着ワイヤを形成する工程と、その後キャピラリを上昇させてワイヤを繰り出し、キャピラリを第2ボンド点の方向に移動させてワイヤを第2ボンド点に接続する工程とを行うので、圧着ボール直上のワイヤに強い屈折部を形成することができ、低ワイヤループ化が図れる。
【図面の簡単な説明】
【図1】本発明のワイヤボンディング方法の第1の実施の形態を示す工程図である。
【図2】図1(g)に続く工程図である。
【図3】本発明のワイヤボンディング方法の第2の実施の形態を示し、図1(f)に続く工程図である。
【図4】本発明のワイヤボンディング方法の第3の実施の形態を示す工程図である。
【図5】本発明のワイヤボンディング方法の第4の実施の形態を示し、図4(c)に続く工程図である。
【符号の説明】
A 第1ボンド点
B 第2ボンド点
1 回路基板
2 電極パッド
3 ダイ
4 ワイヤ
5 キャピラリ
11 圧着ボール
12、13 圧着ワイヤ
21、22、23、24 屈折部
31 水平部分
32 傾斜部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wire bonding method for connecting a first bond point and a second bond point with a wire, and more particularly to a method for forming a low wire loop.
[0002]
[Prior art]
When the wire connecting the first bond point and the second bond point sags, the wire contacts the die and an electrical short circuit occurs. In order to prevent this, conventionally, after a ball is pressed to the first bond point to form a press-bonded ball, a neck height portion extending upward is formed on the press-bonded ball and refracted at the upper end of the neck height portion. A part (癖) is formed (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-189441
[Problems to be solved by the invention]
The prior art method forms a neck height on the crimp ball, which inevitably results in a high wire loop. In recent years, semiconductor devices tend to be smaller and thinner, but the prior art methods have not been able to satisfy this demand sufficiently.
[0005]
An object of the present invention is to provide a wire bonding method in which a strong refracting portion can be formed on a wire immediately above a press-bonded ball and a low wire loop can be achieved.
[0006]
[Means for Solving the Problems]
According to a first aspect of the present invention for solving the above problem, in the wire bonding method for connecting the first bond point and the second bond point with a wire, a ball formed at the tip of the wire at the first bond point Forming a pressure-bonded ball by pressing the wire, and then forming a pressure-bonded wire by pressing the wire onto the pressure-bonded ball, and then raising the capillary to feed the wire in the direction of the second bond point. Moving the wire and connecting the wire to the second bond point.
[0007]
According to a second aspect of the present invention for solving the above problem, in the wire bonding method for connecting the first bond point and the second bond point with a wire, a ball formed at the tip of the wire at the first bond point Forming a pressure-bonded ball by pressing the wire, then pressing the wire onto the pressure-bonded ball to form a pressure-bonded wire, and then raising the capillary, and subsequently moving the capillary in the direction opposite to the second bond point A step of performing at least one reverse operation, and a step of raising the capillary to feed out the wire and moving the capillary in the direction of the second bond point to connect the wire to the second bond point. To do.
[0008]
According to a third aspect of the present invention for solving the above problem, in the first or second aspect of the present invention, the step of forming the crimping wire includes raising the capillary after the crimping ball is formed, Performing a reverse operation by moving in the opposite direction, then lowering the capillary slightly, then raising the capillary, and then moving the capillary in the direction of the second bond point on the opposite side of the second bond point The method includes a step of moving the lower surface of the capillary so as to be positioned above the press-bonded ball, and a step of lowering the capillary and pressing the wire onto the press-bonded ball.
[0009]
According to a fourth aspect of the present invention for solving the above-mentioned problems, in the first or second aspect, the step of forming the crimping wire includes raising the capillary after the crimping ball is formed, and then connecting the capillary to the second bond point. And a step of moving the lower surface of the capillary opposite to the second bond point in the direction of the upper side of the press-bonded ball and a step of lowering the capillary and pressing the wire onto the press-bonded ball. It is characterized by.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the wire bonding method of the present invention will be described with reference to FIGS. As shown in FIG. 2B, a
[0011]
First, as shown in FIG. 1A, a clamper (not shown) for clamping the
[0012]
Next, as shown in FIG. 1D, the
[0013]
Next, as shown in FIG. 1G, the
[0014]
As described above, since the
[0015]
A second embodiment of the wire bonding method of the present invention will be described with reference to FIG. 1 and FIG. 2 are assigned the same reference numerals, and detailed descriptions thereof are omitted. In the present embodiment, as shown in FIG. 3 (e), a refracting
[0016]
First, the crimping
[0017]
In the present embodiment, the following effects can be obtained in addition to the effects of the above embodiments. Since the refracting
[0018]
A third embodiment of the wire bonding method of the present invention will be described with reference to FIG. First, as shown in FIG. 4A, a clamper (not shown) for clamping the
[0019]
Next, as shown in FIG. 4B, the
[0020]
Next, as shown in FIG. 4D, the
[0021]
As described above, the
[0022]
A fourth embodiment of the wire bonding method of the present invention will be described with reference to FIG. In the present embodiment, the second embodiment shown in FIG. 3 is applied to the embodiment shown in FIG. That is, after the crimping
[0023]
In the second embodiment of FIG. 3 and the fourth embodiment of FIG. 5, one refracting
[0024]
【The invention's effect】
The present invention includes a step of pressing a ball formed at the tip of a wire to a first bond point to form a press-bonded ball, a step of pressing a wire on the press-bonded ball to form a press-bonded wire, and a capillary thereafter The wire is fed out and the capillary is moved in the direction of the second bond point to connect the wire to the second bond point, so that a strong refracting portion can be formed on the wire immediately above the press-bonded ball. Thus, a low wire loop can be achieved.
[Brief description of the drawings]
FIG. 1 is a process diagram showing a first embodiment of a wire bonding method of the present invention.
FIG. 2 is a process drawing following FIG.
FIG. 3 shows a second embodiment of the wire bonding method of the present invention and is a process diagram following FIG. 1 (f).
FIG. 4 is a process diagram showing a third embodiment of the wire bonding method of the present invention.
FIG. 5 shows a fourth embodiment of the wire bonding method of the present invention and is a process diagram following FIG. 4 (c).
[Explanation of symbols]
A 1st bond point B
Claims (4)
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JP2003183917A JP4021378B2 (en) | 2003-06-27 | 2003-06-27 | Wire bonding method |
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JP2003183917A JP4021378B2 (en) | 2003-06-27 | 2003-06-27 | Wire bonding method |
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JP2007200800A Division JP4547405B2 (en) | 2007-08-01 | 2007-08-01 | Wire bonding method |
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